Plant Physiol. Illumina
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Characterization of Transgenic Tobacco with an Increased alpha -Linolenic Acid Level1

Tatsurou Hamada2, Hiroaki Kodama3, Keizo Takeshita, Hideo Utsumi, and Koh Iba*

Department of Biology, Faculty of Science, Kyushu University, Fukuoka 812-8581, Japan (T.H., H.K., K.I.); and Department of Biophysics, Faculty of Pharmaceutical Sciences, Kyushu University, Fukuoka 812-8582, Japan (K.T., H.U.)

Microsomal omega -3 fatty acid desaturase catalyzes the conversion of 18:2 (linoleic acid) to 18:3 (alpha -linolenic acid) in phospholipids, which are the main constituents of extrachloroplast membranes. Transgenic tobacco (Nicotiana tabacum) plants with increased 18:3 contents (designated SIIn plants) were produced through the introduction of a construct with the tobacco microsomal omega -3 fatty acid desaturase gene under the control of the highly efficient promoter containing the E12Omega sequence. 18:3 contents in the SIIn plants were increased by about 40% in roots and by about 10% in leaves compared with the control plants. With regard to growth at 15°C and 25°C and the ability to tolerate chilling at 1°C and 5°C, there were no discernible differences between the SIIn and the control plants. Freezing tolerance in leaves and roots, which was assessed by electrolyte leakage, was almost the same between the SIIn and the control plants. The fluidity of plasma membrane from the SIIn plants was almost the same as that of the control plants. These results indicate that an increase in the 18:3 level in phospholipids is not directly involved in compensation for the diminishment in growth or membrane properties observed under low temperatures.

1   This work was supported in part by a grant-in-aid (Biotechnology no. 1317) from the Ministry of Agriculture, Forestry, and Fishery, Japan, and by a grant from the Japan Society for the Promotion of Science (no. JSPS-RFTF96L00602).
2   Present address: The Ishikawa Agricultural College, Nonoichimachi, Ishikawa 921-8836, Japan.
3   Present address: Department of Biochemistry, Faculty of Horticulture, Chiba University, Matsudo City, Chiba 271-8510, Japan.
*   Corresponding author; e-mail koibascb{at}mbox.nc.kyushu-u.ac.jp; fax 81-92-642-2621.

Plant Physiol. (1998) 118: 591-598
Copyright Clearance Center:   0032-0889/98/118//08
© 1998 American Society of Plant Physiologists




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